Section II. ORGANIZATIONAL MAINTENANCE

TM 11-6625-847-12

Sequence

Item to be

No.

Inspected

Procedures

References

Fuses ------------------------------

Check fuses for correct value. Check spares for

Fig. 3-1.

quantity and proper values.

Knobs, controls and switches

Check to be sure that mechanical action of all knobs,

Fig. 3-1 through 3-6.

controls, and switches is smooth and free from

external or internal binding.

Completeness -------------------

Check to see that SM-442A/GRC is complete.

App B.

Indicator lamps ------------------

Check indicator lamps for correct value.

Check

App B.

spares for quantity and proper values.

b. Remove grease, fungus, and ground-in dirt from

4-5.

Cleaning

the case being cleaned; use a cloth dampened (not wet)

Inspect the exterior of the SM-442A/GRC; exterior

with the cleaning compound.

surfaces must be free of dust, dirt, grease, and fungus.

c. Remove dust or dirt from the connectors with a

a. Remove dust and loose dirt with a clean, soft

brush.

cloth.

d. Clean the front panel and the control knob; use

Warning: Prolonged breathing of cleaning

a soft, clean cloth. If dirt is difficult to remove, dampen

compound is dangerous; make sure adequate

the cloth with water; use mild soap if necessary.

ventilation is provided. Cleaning compound is

flammable; do not use near a flame. Avoid contact

with the skin; wash off any that spills on the hands.

Section II. ORGANIZATIONAL MAINTENANCE

c. Counter, Electronic, Digital Readout AN/ USM-

4-6.

Scope of Organizational Maintenance

207.

This

section

contains

instructions

covering

Generator, Signal AN/URM-127.

organizational maintenance of the SM-442A/ GRC. It

includes instructions for performing preventive and

Oscilloscope AN/USM-140.

periodic maintenance services and repair functions to be

Power Supply PP-3940/G.

accomplished by the organizational repairman as

Multimeter ME-26A/U, ME-26B/U, or ME-26C/U.

follows:

a. Organizational preventive maintenance (para 4-

4-8.

Organizational Preventive Maintenance

8).

b. Organizational

quarterly

preventive

a. Organizational preventive maintenance is the

maintenance (para 4-9).

systematic care and inspection of equipment to maintain

c. Organizational

quarterly

preventive

it in serviceable condition, prevent breakdowns, and

maintenance checks and services chart (para 4-10).

assure maximum operational capability. Preventive

d. Preservation (para 4-11).

maintenance is the responsibility of all catagories

e. Lubrication (para 4-12).

concerned with the equipment. It includes inspection,

f. Troubleshooting (para 4-13 through 4-25).

testing, and repair or replacement of parts that

g. Replacement and adjustment (para 4-26).

inspections and tests indicate would probably fail before

the next scheduled periodic service.

Preventive

maintenance checks and services of the SM-442A/GRC

4-7.

Test Equipment Required

at the organizational category are made at quarterly

The test equipment required for organizational

interval, unless otherwise directed by the commanding

maintenance is as follows:

officer.

a. Multimeter AN/PSM-6.

b. Voltmeter, Electronic AN/URM-145.

4-2